
<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
  <head>
    <meta charset="utf-8" />
    <title>modulefinder — Find modules used by a script &#8212; Python 3.8.13 documentation</title><meta name="viewport" content="width=device-width, initial-scale=1.0">
    
    <link rel="stylesheet" href="../_static/pydoctheme.css?2022.1" type="text/css" />
    <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
    
    <script id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script>
    <script src="../_static/jquery.js"></script>
    <script src="../_static/underscore.js"></script>
    <script src="../_static/doctools.js"></script>
    <script src="../_static/language_data.js"></script>
    
    <script src="../_static/sidebar.js"></script>
    
    <link rel="search" type="application/opensearchdescription+xml"
          title="Search within Python 3.8.13 documentation"
          href="../_static/opensearch.xml"/>
    <link rel="author" title="About these documents" href="../about.html" />
    <link rel="index" title="Index" href="../genindex.html" />
    <link rel="search" title="Search" href="../search.html" />
    <link rel="copyright" title="Copyright" href="../copyright.html" />
    <link rel="next" title="runpy — Locating and executing Python modules" href="runpy.html" />
    <link rel="prev" title="pkgutil — Package extension utility" href="pkgutil.html" />
    <link rel="canonical" href="https://docs.python.org/3/library/modulefinder.html" />
    
      
    

    
    <style>
      @media only screen {
        table.full-width-table {
            width: 100%;
        }
      }
    </style>
<link rel="shortcut icon" type="image/png" href="../_static/py.svg" />
            <script type="text/javascript" src="../_static/copybutton.js"></script>
            <script type="text/javascript" src="../_static/menu.js"></script> 

  </head>
<body>
<div class="mobile-nav">
    <input type="checkbox" id="menuToggler" class="toggler__input" aria-controls="navigation"
           aria-pressed="false" aria-expanded="false" role="button" aria-label="Menu" />
    <label for="menuToggler" class="toggler__label">
        <span></span>
    </label>
    <nav class="nav-content" role="navigation">
         <a href="https://www.python.org/" class="nav-logo">
             <img src="../_static/py.svg" alt="Logo"/>
         </a>
        <div class="version_switcher_placeholder"></div>
        <form role="search" class="search" action="../search.html" method="get">
            <svg xmlns="http://www.w3.org/2000/svg" width="20" height="20" viewBox="0 0 24 24" class="search-icon">
                <path fill-rule="nonzero"
                        d="M15.5 14h-.79l-.28-.27a6.5 6.5 0 001.48-5.34c-.47-2.78-2.79-5-5.59-5.34a6.505 6.505 0 00-7.27 7.27c.34 2.8 2.56 5.12 5.34 5.59a6.5 6.5 0 005.34-1.48l.27.28v.79l4.25 4.25c.41.41 1.08.41 1.49 0 .41-.41.41-1.08 0-1.49L15.5 14zm-6 0C7.01 14 5 11.99 5 9.5S7.01 5 9.5 5 14 7.01 14 9.5 11.99 14 9.5 14z" fill="#444"></path>
            </svg>
            <input type="text" name="q" aria-label="Quick search"/>
            <input type="submit" value="Go"/>
        </form>
    </nav>
    <div class="menu-wrapper">
        <nav class="menu" role="navigation" aria-label="main navigation">
            <div class="language_switcher_placeholder"></div>
  <h3><a href="../contents.html">Table of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#"><code class="xref py py-mod docutils literal notranslate"><span class="pre">modulefinder</span></code> — Find modules used by a script</a><ul>
<li><a class="reference internal" href="#example-usage-of-modulefinder">Example usage of <code class="xref py py-class docutils literal notranslate"><span class="pre">ModuleFinder</span></code></a></li>
</ul>
</li>
</ul>

  <h4>Previous topic</h4>
  <p class="topless"><a href="pkgutil.html"
                        title="previous chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">pkgutil</span></code> — Package extension utility</a></p>
  <h4>Next topic</h4>
  <p class="topless"><a href="runpy.html"
                        title="next chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">runpy</span></code> — Locating and executing Python modules</a></p>
  <div role="note" aria-label="source link">
    <h3>This Page</h3>
    <ul class="this-page-menu">
      <li><a href="../bugs.html">Report a Bug</a></li>
      <li>
        <a href="https://github.com/python/cpython/blob/3.8/Doc/library/modulefinder.rst"
            rel="nofollow">Show Source
        </a>
      </li>
    </ul>
  </div>
        </nav>
    </div>
</div>

  
    <div class="related" role="navigation" aria-label="related navigation">
      <h3>Navigation</h3>
      <ul>
        <li class="right" style="margin-right: 10px">
          <a href="../genindex.html" title="General Index"
             accesskey="I">index</a></li>
        <li class="right" >
          <a href="../py-modindex.html" title="Python Module Index"
             >modules</a> |</li>
        <li class="right" >
          <a href="runpy.html" title="runpy — Locating and executing Python modules"
             accesskey="N">next</a> |</li>
        <li class="right" >
          <a href="pkgutil.html" title="pkgutil — Package extension utility"
             accesskey="P">previous</a> |</li>

          <li><img src="../_static/py.svg" alt="python logo" style="vertical-align: middle; margin-top: -1px"/></li>
          <li><a href="https://www.python.org/">Python</a> &#187;</li>
          <li class="switchers">
            <div class="language_switcher_placeholder"></div>
            <div class="version_switcher_placeholder"></div>
          </li>
          <li>
              
          </li>
    <li id="cpython-language-and-version">
      <a href="../index.html">3.8.13 Documentation</a> &#187;
    </li>

          <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> &#187;</li>
          <li class="nav-item nav-item-2"><a href="modules.html" accesskey="U">Importing Modules</a> &#187;</li>
                <li class="right">
                    

    <div class="inline-search" role="search">
        <form class="inline-search" action="../search.html" method="get">
          <input placeholder="Quick search" aria-label="Quick search" type="text" name="q" />
          <input type="submit" value="Go" />
          <input type="hidden" name="check_keywords" value="yes" />
          <input type="hidden" name="area" value="default" />
        </form>
    </div>
                     |
                </li>
            
      </ul>
    </div>    

    <div class="document">
      <div class="documentwrapper">
        <div class="bodywrapper">
          <div class="body" role="main">
            
  <div class="section" id="module-modulefinder">
<span id="modulefinder-find-modules-used-by-a-script"></span><h1><a class="reference internal" href="#module-modulefinder" title="modulefinder: Find modules used by a script."><code class="xref py py-mod docutils literal notranslate"><span class="pre">modulefinder</span></code></a> — Find modules used by a script<a class="headerlink" href="#module-modulefinder" title="Permalink to this headline">¶</a></h1>
<p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.8/Lib/modulefinder.py">Lib/modulefinder.py</a></p>
<hr class="docutils" />
<p>This module provides a <a class="reference internal" href="#modulefinder.ModuleFinder" title="modulefinder.ModuleFinder"><code class="xref py py-class docutils literal notranslate"><span class="pre">ModuleFinder</span></code></a> class that can be used to determine
the set of modules imported by a script. <code class="docutils literal notranslate"><span class="pre">modulefinder.py</span></code> can also be run as
a script, giving the filename of a Python script as its argument, after which a
report of the imported modules will be printed.</p>
<dl class="function">
<dt id="modulefinder.AddPackagePath">
<code class="sig-prename descclassname">modulefinder.</code><code class="sig-name descname">AddPackagePath</code><span class="sig-paren">(</span><em class="sig-param">pkg_name</em>, <em class="sig-param">path</em><span class="sig-paren">)</span><a class="headerlink" href="#modulefinder.AddPackagePath" title="Permalink to this definition">¶</a></dt>
<dd><p>Record that the package named <em>pkg_name</em> can be found in the specified <em>path</em>.</p>
</dd></dl>

<dl class="function">
<dt id="modulefinder.ReplacePackage">
<code class="sig-prename descclassname">modulefinder.</code><code class="sig-name descname">ReplacePackage</code><span class="sig-paren">(</span><em class="sig-param">oldname</em>, <em class="sig-param">newname</em><span class="sig-paren">)</span><a class="headerlink" href="#modulefinder.ReplacePackage" title="Permalink to this definition">¶</a></dt>
<dd><p>Allows specifying that the module named <em>oldname</em> is in fact the package named
<em>newname</em>.</p>
</dd></dl>

<dl class="class">
<dt id="modulefinder.ModuleFinder">
<em class="property">class </em><code class="sig-prename descclassname">modulefinder.</code><code class="sig-name descname">ModuleFinder</code><span class="sig-paren">(</span><em class="sig-param">path=None</em>, <em class="sig-param">debug=0</em>, <em class="sig-param">excludes=[]</em>, <em class="sig-param">replace_paths=[]</em><span class="sig-paren">)</span><a class="headerlink" href="#modulefinder.ModuleFinder" title="Permalink to this definition">¶</a></dt>
<dd><p>This class provides <a class="reference internal" href="#modulefinder.ModuleFinder.run_script" title="modulefinder.ModuleFinder.run_script"><code class="xref py py-meth docutils literal notranslate"><span class="pre">run_script()</span></code></a> and <a class="reference internal" href="#modulefinder.ModuleFinder.report" title="modulefinder.ModuleFinder.report"><code class="xref py py-meth docutils literal notranslate"><span class="pre">report()</span></code></a> methods to determine
the set of modules imported by a script. <em>path</em> can be a list of directories to
search for modules; if not specified, <code class="docutils literal notranslate"><span class="pre">sys.path</span></code> is used.  <em>debug</em> sets the
debugging level; higher values make the class print debugging messages about
what it’s doing. <em>excludes</em> is a list of module names to exclude from the
analysis. <em>replace_paths</em> is a list of <code class="docutils literal notranslate"><span class="pre">(oldpath,</span> <span class="pre">newpath)</span></code> tuples that will
be replaced in module paths.</p>
<dl class="method">
<dt id="modulefinder.ModuleFinder.report">
<code class="sig-name descname">report</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#modulefinder.ModuleFinder.report" title="Permalink to this definition">¶</a></dt>
<dd><p>Print a report to standard output that lists the modules imported by the
script and their paths, as well as modules that are missing or seem to be
missing.</p>
</dd></dl>

<dl class="method">
<dt id="modulefinder.ModuleFinder.run_script">
<code class="sig-name descname">run_script</code><span class="sig-paren">(</span><em class="sig-param">pathname</em><span class="sig-paren">)</span><a class="headerlink" href="#modulefinder.ModuleFinder.run_script" title="Permalink to this definition">¶</a></dt>
<dd><p>Analyze the contents of the <em>pathname</em> file, which must contain Python
code.</p>
</dd></dl>

<dl class="attribute">
<dt id="modulefinder.ModuleFinder.modules">
<code class="sig-name descname">modules</code><a class="headerlink" href="#modulefinder.ModuleFinder.modules" title="Permalink to this definition">¶</a></dt>
<dd><p>A dictionary mapping module names to modules. See
<a class="reference internal" href="#modulefinder-example"><span class="std std-ref">Example usage of ModuleFinder</span></a>.</p>
</dd></dl>

</dd></dl>

<div class="section" id="example-usage-of-modulefinder">
<span id="modulefinder-example"></span><h2>Example usage of <a class="reference internal" href="#modulefinder.ModuleFinder" title="modulefinder.ModuleFinder"><code class="xref py py-class docutils literal notranslate"><span class="pre">ModuleFinder</span></code></a><a class="headerlink" href="#example-usage-of-modulefinder" title="Permalink to this headline">¶</a></h2>
<p>The script that is going to get analyzed later on (bacon.py):</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="kn">import</span> <span class="nn">re</span><span class="o">,</span> <span class="nn">itertools</span>

<span class="k">try</span><span class="p">:</span>
    <span class="kn">import</span> <span class="nn">baconhameggs</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
    <span class="k">pass</span>

<span class="k">try</span><span class="p">:</span>
    <span class="kn">import</span> <span class="nn">guido.python.ham</span>
<span class="k">except</span> <span class="ne">ImportError</span><span class="p">:</span>
    <span class="k">pass</span>
</pre></div>
</div>
<p>The script that will output the report of bacon.py:</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">modulefinder</span> <span class="kn">import</span> <span class="n">ModuleFinder</span>

<span class="n">finder</span> <span class="o">=</span> <span class="n">ModuleFinder</span><span class="p">()</span>
<span class="n">finder</span><span class="o">.</span><span class="n">run_script</span><span class="p">(</span><span class="s1">&#39;bacon.py&#39;</span><span class="p">)</span>

<span class="nb">print</span><span class="p">(</span><span class="s1">&#39;Loaded modules:&#39;</span><span class="p">)</span>
<span class="k">for</span> <span class="n">name</span><span class="p">,</span> <span class="n">mod</span> <span class="ow">in</span> <span class="n">finder</span><span class="o">.</span><span class="n">modules</span><span class="o">.</span><span class="n">items</span><span class="p">():</span>
    <span class="nb">print</span><span class="p">(</span><span class="s1">&#39;</span><span class="si">%s</span><span class="s1">: &#39;</span> <span class="o">%</span> <span class="n">name</span><span class="p">,</span> <span class="n">end</span><span class="o">=</span><span class="s1">&#39;&#39;</span><span class="p">)</span>
    <span class="nb">print</span><span class="p">(</span><span class="s1">&#39;,&#39;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="nb">list</span><span class="p">(</span><span class="n">mod</span><span class="o">.</span><span class="n">globalnames</span><span class="o">.</span><span class="n">keys</span><span class="p">())[:</span><span class="mi">3</span><span class="p">]))</span>

<span class="nb">print</span><span class="p">(</span><span class="s1">&#39;-&#39;</span><span class="o">*</span><span class="mi">50</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s1">&#39;Modules not imported:&#39;</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s1">&#39;</span><span class="se">\n</span><span class="s1">&#39;</span><span class="o">.</span><span class="n">join</span><span class="p">(</span><span class="n">finder</span><span class="o">.</span><span class="n">badmodules</span><span class="o">.</span><span class="n">keys</span><span class="p">()))</span>
</pre></div>
</div>
<p>Sample output (may vary depending on the architecture):</p>
<div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="n">Loaded</span> <span class="n">modules</span><span class="p">:</span>
<span class="n">_types</span><span class="p">:</span>
<span class="n">copyreg</span><span class="p">:</span>  <span class="n">_inverted_registry</span><span class="p">,</span><span class="n">_slotnames</span><span class="p">,</span><span class="n">__all__</span>
<span class="n">sre_compile</span><span class="p">:</span>  <span class="n">isstring</span><span class="p">,</span><span class="n">_sre</span><span class="p">,</span><span class="n">_optimize_unicode</span>
<span class="n">_sre</span><span class="p">:</span>
<span class="n">sre_constants</span><span class="p">:</span>  <span class="n">REPEAT_ONE</span><span class="p">,</span><span class="n">makedict</span><span class="p">,</span><span class="n">AT_END_LINE</span>
<span class="n">sys</span><span class="p">:</span>
<span class="n">re</span><span class="p">:</span>  <span class="vm">__module__</span><span class="p">,</span><span class="n">finditer</span><span class="p">,</span><span class="n">_expand</span>
<span class="n">itertools</span><span class="p">:</span>
<span class="n">__main__</span><span class="p">:</span>  <span class="n">re</span><span class="p">,</span><span class="n">itertools</span><span class="p">,</span><span class="n">baconhameggs</span>
<span class="n">sre_parse</span><span class="p">:</span>  <span class="n">_PATTERNENDERS</span><span class="p">,</span><span class="n">SRE_FLAG_UNICODE</span>
<span class="n">array</span><span class="p">:</span>
<span class="n">types</span><span class="p">:</span>  <span class="vm">__module__</span><span class="p">,</span><span class="n">IntType</span><span class="p">,</span><span class="n">TypeType</span>
<span class="o">---------------------------------------------------</span>
<span class="n">Modules</span> <span class="ow">not</span> <span class="n">imported</span><span class="p">:</span>
<span class="n">guido</span><span class="o">.</span><span class="n">python</span><span class="o">.</span><span class="n">ham</span>
<span class="n">baconhameggs</span>
</pre></div>
</div>
</div>
</div>


          </div>
        </div>
      </div>
      <div class="sphinxsidebar" role="navigation" aria-label="main navigation">
        <div class="sphinxsidebarwrapper">
  <h3><a href="../contents.html">Table of Contents</a></h3>
  <ul>
<li><a class="reference internal" href="#"><code class="xref py py-mod docutils literal notranslate"><span class="pre">modulefinder</span></code> — Find modules used by a script</a><ul>
<li><a class="reference internal" href="#example-usage-of-modulefinder">Example usage of <code class="xref py py-class docutils literal notranslate"><span class="pre">ModuleFinder</span></code></a></li>
</ul>
</li>
</ul>

  <h4>Previous topic</h4>
  <p class="topless"><a href="pkgutil.html"
                        title="previous chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">pkgutil</span></code> — Package extension utility</a></p>
  <h4>Next topic</h4>
  <p class="topless"><a href="runpy.html"
                        title="next chapter"><code class="xref py py-mod docutils literal notranslate"><span class="pre">runpy</span></code> — Locating and executing Python modules</a></p>
  <div role="note" aria-label="source link">
    <h3>This Page</h3>
    <ul class="this-page-menu">
      <li><a href="../bugs.html">Report a Bug</a></li>
      <li>
        <a href="https://github.com/python/cpython/blob/3.8/Doc/library/modulefinder.rst"
            rel="nofollow">Show Source
        </a>
      </li>
    </ul>
  </div>
        </div>
      </div>
      <div class="clearer"></div>
    </div>  
    <div class="related" role="navigation" aria-label="related navigation">
      <h3>Navigation</h3>
      <ul>
        <li class="right" style="margin-right: 10px">
          <a href="../genindex.html" title="General Index"
             >index</a></li>
        <li class="right" >
          <a href="../py-modindex.html" title="Python Module Index"
             >modules</a> |</li>
        <li class="right" >
          <a href="runpy.html" title="runpy — Locating and executing Python modules"
             >next</a> |</li>
        <li class="right" >
          <a href="pkgutil.html" title="pkgutil — Package extension utility"
             >previous</a> |</li>

          <li><img src="../_static/py.svg" alt="python logo" style="vertical-align: middle; margin-top: -1px"/></li>
          <li><a href="https://www.python.org/">Python</a> &#187;</li>
          <li class="switchers">
            <div class="language_switcher_placeholder"></div>
            <div class="version_switcher_placeholder"></div>
          </li>
          <li>
              
          </li>
    <li id="cpython-language-and-version">
      <a href="../index.html">3.8.13 Documentation</a> &#187;
    </li>

          <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> &#187;</li>
          <li class="nav-item nav-item-2"><a href="modules.html" >Importing Modules</a> &#187;</li>
                <li class="right">
                    

    <div class="inline-search" role="search">
        <form class="inline-search" action="../search.html" method="get">
          <input placeholder="Quick search" aria-label="Quick search" type="text" name="q" />
          <input type="submit" value="Go" />
          <input type="hidden" name="check_keywords" value="yes" />
          <input type="hidden" name="area" value="default" />
        </form>
    </div>
                     |
                </li>
            
      </ul>
    </div>  
    <div class="footer">
    &copy; <a href="../copyright.html">Copyright</a> 2001-2022, Python Software Foundation.
    <br />
    This page is licensed under the Python Software Foundation License Version 2.
    <br />
    Examples, recipes, and other code in the documentation are additionally licensed under the Zero Clause BSD License.
    <br />
    
    <br />

    The Python Software Foundation is a non-profit corporation.
<a href="https://www.python.org/psf/donations/">Please donate.</a>
<br />
    <br />

    Last updated on Mar 17, 2022.
    <a href="https://docs.python.org/3/bugs.html">Found a bug</a>?
    <br />

    Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 2.4.4.
    </div>

  </body>
</html>